Re: busy disks - a lot of write activities on / part

In response to Garrett Cooper <youshi10@xxxxxxxxxxxxxxxx>:

On Jun 28, 2006, at 8:51 AM, Tamouh H. wrote:


I'm diagnosing a slow hard disk issues , trying to determine where
the bottleneck in all of this. The system is FreeBSD 5.4 with SCSI
U320 drives in RAID-5 on Adaptec 2130SLP Controller.

I'm noticing the / boot partition has the most activities for
writes/Busy and was wondering if anyone can shed some lights on
this and what can possibly be done to speed up the drives.

doing 'gstat' shows:

dT: 0.510 flag_I 500000us sizeof 240 i -1
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 0 0 0 0.0 0 0 0.0 0.0| acd0
1 141 6 259 6.6 135 1466 121.0 94.3| aacd0
0 0 0 0 0.0 0 0 0.0 0.0| aacd1
0 0 0 0 0.0 0 0 0.0 0.0| acd0t01
1 141 6 259 6.7 135 1466 121.0 94.5| aacd0s1
0 0 0 0 0.0 0 0 0.0 0.0| aacd1s1
1 61 0 0 0.0 61 549 16.6 101.2|
aacd0s1a
0 0 0 0 0.0 0 0 0.0 0.0|
aacd0s1b
0 0 0 0 0.0 0 0 0.0 0.0|
aacd0s1c
0 73 0 0 0.0 73 906 205.1 48.6|
aacd0s1d
0 4 2 4 7.9 2 12 242.6 49.1|
aacd0s1e
0 4 4 255 6.1 0 0 0.0 2.4|
aacd0s1f
0 0 0 0 0.0 0 0 0.0 0.0|
aacd1s1c
0 0 0 0 0.0 0 0 0.0 0.0|
aacd1s1d
0 0 0 0 0.0 0 0 0.0 0.0|
aacd1s1e

This is df:

Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/aacd0s1a 809998 59430 685770 8% /
devfs 1 1 0 100% /dev
/dev/aacd1s1e 1722888 14892 1570166 1% /tmp
/dev/aacd0s1f 209955742 62440662 130718622 32% /home
/dev/aacd0s1d 35921132 6151076 26896366 19% /usr
/dev/aacd0s1e 22270798 3480300 17008836 17% /var
devfs 1 1 0 100% /var/named/dev
procfs 4 4 0 100% /proc
/dev/aacd1s1d 137099908 70149522 55982394 56% /backup

Any info on matter of disks performance is much appreciated.

Thx,

Tamouh Hakmi

Try compiling and installing lsof in ports. That may help in
determining what files are open so then you can trace the files back
to any given processes that may still have the files open, so then
you can determine the bottlenecks better.

lsof is nice, but don't forget about fstat, which comes with FreeBSD.

--
Bill Moran
Collaborative Fusion Inc.

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